Windowing Design Document

[Aljoscha Krettek <al...@apache.org>]

Hi All,
I added a new document along the existing design documents in the wiki:
https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=60624830.
It's very bare-bones right now but we can flesh it out together. I put some
requirements that I think are good but please add other stuff or write
here. I'll add some descriptions of a prototype that I have been working on
tomorrow. This can already do windowing with out-of-order elements but
there is still a lot to be figured out.

Cheers,
Aljoscha